1. An appraisal of the Great Basin Middle Cambrian trilobites described before 1900, Author/Creator: Palmer, Allison R. Publication/Creation: Washington : U.S. Govt. Print. Off, 1954 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 264A-264J. Access & Availability: Loading
2. An appraisal of the Great Basin Middle Cambrian trilobites described before 1900 Author/Creator: Palmer, Allison R., author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1954 Resource Type: Book Access & Availability: Loading